March 4, 2007
wet NMR solvents
The deuterated benzene bomb in the lab is dried using CaH2, which should be a pretty effective drying agent. I prefer it to NaK alloy, mostly because you don't have to worry about the flask exploding after you finish transferring all of the solvent off. The downside is that you miss the pleasure of the deep purple color of the NaK benzophenone ketyl which tells you definitively that your solvent is indeed H2O free. After several crappy NMR spectra using the C6D6 over CaH2, a blank spectrum confirmed that my solvent was wet. I made a new bomb and then quenched the leftovers. (No fizz, of course.) The new bomb has a much whiter color to it than the wet bomb, which only brings to my attention three other solvent bombs in the lab sporting a depressingly dark grey color. SEP? you betcha. Maybe now I'll be able to tell if the sublimation worked or not.
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2 comments:
are you using this blog as a way to track your studies? i thought this was going to be made for people who are non-chemists to read, but it seems like the only folks who can read it would have to have a large base of chemical knowledge...just a question...
Explanation of discrete details so that a person with little background knowledge of inert atmosphere chemistry techniques could understand it would make this blog almost unreadable. As it is, it is written so that someone with a basic knowledge of chemistry can follow along but probably will still miss the specialized jargon. Hopefully, anyone can read and gauge the mood of the author without getting hung-up on the details of the chemistry. That being said, the intended audience is someone with a pre-existing knowledge of the subject matter.
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